"春暖花开" 的英文说法是 "spring is in full bloom"。这个说法源自一句中文谚语，即 "春暖花开，怒放的花朵盛开在春天"。可以用一些例句来说明这个说法的意思：

The cherry blossoms are in full bloom, signaling that spring is here. (樱花盛开，春天到了。)

The fields are green and vibrant, with flowers in full bloom. (田野青绿，花儿盛开。)

I love the feeling of spring, when the world is in full bloom and everything feels new. (我喜欢春天的感觉，世界盛开，一切都充满新鲜感。)